磺酸基遥爪液晶离聚物的合成与表征

Synthesis of Telechelic Liquid Crystalline Ionomers Containing Sulfonate Groups

采用溶液缩聚法将活性端基为TPC的液晶聚合物与对羟基偶氮苯磺酸反应制得端基为磺酸基的遥爪主链液晶离聚物。利用红外光谱分析对其结构进行了表征,采用偏光显微镜、示差扫描量热仪和广角X射线衍射等手段对其液晶性能进行了表征。结果表明:各离聚物与原没有加入离子单体的聚合物具有相同的织构,均为向列型液晶。对于同一链段长度的聚合物,当引入离子单体的含量增加时,液晶性逐渐消失;各液晶离聚物的介晶转变温度Tc和熔点Tm随着离子加入量的增加略有增加,但Tg降低。

Thermotropic main-chain liquid crystalline ionomers containing sulfornate groups was synthesized with liquid crystalline polymer and hydroxyl-azobenzensulfonic acid. The chemical structure, thermal properties and liquid crystalline character of liquid crystalline ionomers were analyzed with FT-IR, POM, DSC and WAXD, the result shows the ionomers have the same structures—— nematic texture -with the previous polymers before ion monomer was added. This indicates the addition of ion monomer actually has no impact on the type of liquid crystal; however, to the same length of polymer chains, their liquid crystal properties gradually disappear as the increasing of addition of ion monomers, Tc and Tm of each liquid crystalline ionomers are increased with adding ionomers, but Tg is reduced.